<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    request.setAttribute("username","admin");
%>
<c:out value="${pageScope.username}" default="<h1>无此数据</h1>" escapeXml="false"></c:out>
<c:out value="${requestScope.username}" default="<h1>赵乾坤最棒</h1>" escapeXml="ture"></c:out>
</body>
</html>

